$OpenBSD: patch-CMakeLists_txt,v 1.4 2016/10/18 09:23:34 sthen Exp $
--- CMakeLists.txt.orig	Wed Sep 28 19:18:16 2016
+++ CMakeLists.txt	Tue Oct 18 09:42:21 2016
@@ -104,7 +104,10 @@ endif()
 option(BUILD_DOC "Build the HTML documentation (with doxygen if available)." OFF)
 
 string(TOLOWER ${PROJECT_NAME} projectname)
-set(OPENJPEG_INSTALL_SUBDIR "${projectname}-${OPENJPEG_VERSION_MAJOR}.${OPENJPEG_VERSION_MINOR}")
+
+if(NOT OPENJPEG_INSTALL_SUBDIR)
+  set(OPENJPEG_INSTALL_SUBDIR "${projectname}-${OPENJPEG_VERSION_MAJOR}.${OPENJPEG_VERSION_MINOR}")
+endif()
 
 if(NOT OPENJPEG_INSTALL_BIN_DIR)
   set(OPENJPEG_INSTALL_BIN_DIR "bin")
